[Webkit-unassigned] [Bug 68245] New: [Chromium] Use SkPicture to defer 2d canvas draw operation and run them in batches

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=68245

           Summary: [Chromium] Use SkPicture to defer 2d canvas draw
                    operation and run them in batches
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: ASSIGNED
          Severity: Normal
          Priority: P2
         Component: Canvas
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: junov at chromium.org
                CC: senorblanco at chromium.org, jamesr at chromium.org,
                    vangelis at chromium.org, mdelaney at apple.com,
                    bsalomon at google.com


Make canvas drawing asynchronous by using SkPicture.
The purpose of this change is to improve performance by:
- batching rendering work.
- Deferring the graphics context creation, and in many cases reuse the compositor's context, so creating a new context is avoided.
- Automatic switch to the software canvas implementation when the first synchronous operation is a readback.

This improvement will also open the way for other future improvements (to be submitted separately)
- Skip the rendering of undisplayed frames (ï.e. when frame rate > video refresh rate)
- Eliminate the rendering of out of view canvases.

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